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RCS system, with Reinforced Concrete columns and Steel beams, is defined as a system in which both steel and concrete materials are efficiently combined to maximize the structural and economic advantages of each material. Tested in this study were 6 exterior beam-to-column joint specimens with variables that influence joint rigidity of RCS structure.The purpose of this study is to compare and analyze the structural behavior of exterior joints through the existing studies and tests, and a stydy of flexibility performance of joint has been conducted. As a results we can offer basic data for practical use of RCS structure